Water in a canal, 30dm wide and 12dm deep, is flowing with a velocity of 20km per hour. How much area will it irrigate in 30min, if 9cm of standing water is desired?
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Step-by-step explanation:
Velocity of water=20Km/h
Water in the canal forms a cuboid of breadth = 12dm=1012m=1.2m
Height = 30dm=1030m=3m
Length = Distance covered by water in 30 minutes
= Velocity of water × time
=20000×6030=10000 m
Therefore,
Volume of water flown in 30 min = lbh=(1.2×3×10000)=36000 m3
Suppose area irrigated be A m2. Then,
A×1009= Volume flown in 30 minutes
A×1009=36000
A=400000 m2
Hence, area irrigated =400000 m2
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